Preparation and structural characterization of tetracoordinated tungsten(II) diazadiene complexes

Reduction in situ of WCl4(MeCN)2 with zinc in the presence of diazadiene ligands 1b–f is reported and produces a series of diamagnetic complexes (DAD)WCl22b–f. All complexes were characterized by 1H, 13C NMR and IR spectroscopic data. The crystal structures of complexes 2b and 2e were solved by X-ray diffraction methods.